Multi-layered stretched resin film

ABSTRACT

The present invention discloses a multi-layered stretched resin film which comprises a base layer (A) containing 40 to 90 wt % of a polyolefinic resin and 10 to 60 wt % of an inorganic fine powder or an organic filler; and an amorphous resin-containing layer (B) provided on at least one side of such base layer (A), and containing 0 to 85 wt % of a polyolefinic resin and 15 to 100 wt % of an amorphous resin; where the amorphous resin-containing layer (B) has a porosity of 5% or below. Such multi-layered stretched resin film is successfully exempt from being waved or curled due to vehicle contained in offset printing ink during offset printing, and can thus ensure excellent printability.

TECHNICAL FIELD

[0001] The present invention relates to a multi-layered stretched resinfilm which is successfully exempt from being waved or curled due tovehicle contained in offset printing ink during offset printing,prevented from being delayed in the ink drying property, and thus has anexcellent printability. Such multi-layered stretched resin film isadvantageous when used as a material for map, book cover, wrappingpaper, book paper, sticker sheet, poster paper, menu sheet, hangingscreen, label, shopping bag, cardboard, brochure, illuminated sign boardand so forth.

BACKGROUND ART

[0002] Synthetic paper has proposed and put into practical use in recentyears in place of conventional natural pulp-made paper, where thesynthetic paper comprises a base layer made of a biaxially stretchedpolypropylene film containing 5 to 40 wt % of an inorganic fine powder,and a paper-like layer stacked on the top and back planes thereof, whichis made of a uniaxially stretched polypropylene film containing 8 to 65wt % of an inorganic fine powder (U.S. Pat. No. 418,950, JapaneseExamined Patent Publication Nos. 46-40794, 60-36173 and 62-35412).

[0003] Offset printing, so-called lithograph, is generally applied forprinting on paper, polyethylene terephthalate film, polyamide film,coated paper and the like, since the technique can readily providemulti-color printing. Typical composition of a general-purpose, dry-typeoffset printing ink is shown below.

TABLE 1 Composition of Offset Printing Ink (weight part) ink for ink forink for sheet non-paper rotary offset printing printing press pigment 2525 25 resin 25 30 25 drying oil 20 34 10 high-boiling-point, 25  5 36petroleum-base solvent drier  1  2 — others  4  4  4 total 100 100 100

[0004] The vehicle described in the above refers to a liquid componentamong various components composing printing ink, and is responsible fordispersing pigment to thereby keep fluidity of the ink; for ensuringsmooth movement of the ink from an ink pot to a printing plane afterbeing transferred among individual rollers, plate and blanket; and forfixing the pigment onto the printing plane through solidification. Inresponse to recent strong requirement to shorten the drying time of theoffset printing ink for more rapid printing, there is an increasingtrend of using quick-drying ink having compounded therein a vehiclewhich mainly comprises a drying oil added with resin and mineral oil(high-boiling-point, petroleum-base solvent).

[0005] Printing with such quick-drying offset printing ink on thesynthetic paper comprising a polyolefinic film or such film compoundedwith an inorganic fine powder, however, undesirably swells thepolyolefin per se due to the vehicle contained in the quick-dryingoffset printing ink to thereby produce local surface waving or curlingof the printed film, which has been an obstacle for the practical use.So that the conventional offset printing ink for polyolefinic film hasbeen such that having a special formula without mineral oil at thesacrifice of the quick-drying property.

[0006] Such special offset printing ink for polyolefinic film, however,requires long drying time and has been only available in limitedprinting works and manufacturers, so that there has been a strong needfor a new polyolefinic film on which the general-purpose offset printingink of oxidation polymerization type (drying oil type) is available.

[0007] That is, in the general printing works, offset printing ispracticed on pulp-base paper such as wood free paper and coated paperusing generally-commercialized, quick-drying ink, so that printing onthe polyolefinic film or synthetic paper requires temporary replacementof such ink with the special offset printing ink suitable for suchnon-absorbent material. Such replacement of the ink is, however,considerably time- and labor-consuming, so that the general printingworks have not been positive about printing on the polyolefinic film orsynthetic paper, which has been one factor obstructing thegeneralization of the polyolefinic film or synthetic paper in offsetprinting.

[0008] One approach has been made (Laid-Open Japanese Patent PublicationNo. 8-333466), in which a polyolefinic resin added with an amorphousresin is used as a part of the multi-layered film. Such technique is,however, still not successful in solving the problem of swelling of thefilm (referred to as “solvent attack” hereinafter) as a whole due tovehicle (in particular high-boiling-point, petroleum-base solvent suchas mineral oil) contained in the offset printing ink.

[0009] It is therefore an object of the present invention to provide amulti-layered stretched resin film excellent in ink drying property, andless causative of surface waving or entire curling even if the film issubjected to offset printing using a general-purpose, quick-dryingoffset printing ink.

DISCLOSURE OF THE INVENTION

[0010] The present inventors found out after extensive investigationsfor solving the foregoing problems that adding an amorphous resin in aproper ratio to one layer composing a thermoplastic resin film, andstretching such film so as to lower the porosity of such layersuccessfully improve the solvent attack. It was also found that a properblending of an inorganic fine powder or an organic filler in particularto the uppermost layer can improve the ink drying property and thus canprovide a multi-layered stretched resin film excellent in the printingproperty.

[0011] The present invention is to provide a multi-layered stretchedresin film comprising a base layer (A) containing 40 to 90 wt % of apolyolefinic resin and 10 to 60 wt % of an inorganic fine powder or anorganic filler; and an amorphous resin-containing layer (B) provided onat least one side of such base layer (A), and containing 0 to 85 wt % ofa polyolefinic resin and 15 to 100 wt % of an amorphous resin; in whichamorphous resin-containing layer (B) has a porosity of 5% or below.

[0012] The amorphous resin used for the multi-layered stretched resinfilm of the present invention is preferably a cycloolefinic resin, andpreferably has a glass transition point of 140° C. or below. Thepolyolefinic resin contained in the amorphous resin-containing layer (B)is any one of propylene-base resin, ethylene-base resin and a mixturethereof. The amorphous resin-containing layer (B) preferably has athickness of 1 to 100 μm.

[0013] In the present invention, it is preferable that the multi-layeredstretched resin film further comprises a surface layer (C) containing 30to 85 wt % of a polyolefinic resin and 15 to 70 wt % of an inorganicfine powder or an organic filler, in which the surface layer (C) isprovided on at least one side of a stack which comprises the base layer(A) and the amorphous resin-containing layer (B) provided on at leastone side thereof. The surface layer (C) preferably has a thickness of 1to 100 μm. The grain size of the inorganic fine powder or the averagedispersion grain size of the organic filler in the surface layer (C) ispreferably within a range from 0.01 to 6 μm, where the inorganic finepowder or the organic filler in the surface layer (C) preferablycomprises calcium carbonate, in particular surface-modified calciumcarbonate. The surface layer (C) preferably has a smoothness incompliance with JIS P-8119 of 20,000 sec or below.

[0014] In the present invention, layer constitution involving the baselayer (A) and the amorphous resin-containing layer (B) and/or surfacelayer(C) are preferably such that being expressed as(C)/(B)/(A)/(B)/(C), (C)/(B)/(A)/(B), (C)/(B)/(A)/(C), (C)/(B)/(A),(B)/(A)/(B), (B)/(A)/(C) and (B)/(A).

[0015] It is preferable that the multi-layered stretched resin film ofthe present invention further comprises an intermediate layer (D)comprising a polypropylene-base resin containing 8 to 55 wt % of aninorganic fine powder, in which the intermediate layer (D) is providedbetween the base layer (A) and the amorphous resin-containing layer (B)or the surface layer (C). The intermediate layer (D) preferably containsany one low-melting-point resin selected from the group comprisingpropylene-base copolymer, high-density polyethylene, polystyrene orethylene-vinyl acetate copolymer.

[0016] The multi-layered stretched resin film of the present inventionpreferably has an opacity in compliance with JIS P-8138 of 70% or above,and preferably has on the outermost layer thereof a pigment coatedlayer.

[0017] It should now be noted that, in this specification, any notationusing a word “to” indicates a range defined by values placed before andafter such word, where both ends of such range are included as minimumand maximum values.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018]FIG. 1 is a schematic view explaining a curl height, wherereference numeral 1 represents a printed matter, 2 represents a flattable, and h represents curl height.

DETAILED DESCRIPTION OF THE INVENTION

[0019] The multi-layered stretched resin film of the present inventionwill be detailed hereinafter. The multi-layered stretched resin film ofthe present invention has, as an essential constitutional element, aconstitution which comprises a base layer (A) containing 40 to 90 wt %of a polyolefinic resin and 10 to 60 wt % of an inorganic fine powder oran organic filler; and an amorphous resin-containing layer (B) providedon at least one side of such base layer (A), and containing 0 to 85 wt %of a polyolefinic resin and 15 to 100 wt % of an amorphous resin. In onepreferable embodiment of the present invention, the multi-layeredstretched resin film further comprises a surface layer (C) containing 30to 85 wt % of a polyolefinic resin and 15 to 70 wt % of an inorganicfine powder or an organic filler, the surface layer (C) being providedon at least one side of a stack which comprises the base layer (A) andthe amorphous resin-containing layer (B). The following description willthen go through the base layer (A); amorphous resin-containing layer (B)and surface layer (C) in this order, which will be followed bydescription of a method for producing such multi-layered stretched resinfilm.

[0020] Base Layer (A)

[0021] The base layer (A) of the multi-layered stretched resin film ofthe present invention contains 40 to 90 wt % of a polyolefinic resin and10 to 60 wt % of an inorganic fine powder or an organic filler.

[0022] There is no special limitation on the species of the polyolefinicresin used for the base layer (A).

[0023] Examples of such polyolefinic resins include homopolymer of C₂₋₈α-olefins such as ethylene, propylene, 1-butene, 1-hexene, 1-heptene,1-octene, 4-methyl-1-pentene and 3-methyl-1-pentene; and copolymers of 2to 5 species selected from such α-olefins. Either random copolymer orblock copolymer is allowable. More specifically, allowable are branchedor normal polyethylene having a density of 0.89 to 0.97 g/cm³ and a meltflow rate (190° C., 2.16 kg load) of 1 to 10 g/10 minutes; and polymershaving a melt flow rate (230° C., 2.16 kg load) of 0.2 to 20 g/10minutes such as propylene homopolymer, (4-methyl-1-pentene) homopolymer,propylene-ethylene copolymer, propylene-(1-butene) copolymer,propylene-ethylene-(1-butene) copolymer, propylene-(4-methyl-1-pentene)copolymer, propylene-(3-methyl-1-pentene) copolymer, poly(1-butene),poly(4-methyl-1-pentene) and propylene-ethylene-(3-methyl-1-pentene)copolymer. Among these, propylene homopolymer; ethylene-propylene randomcopolymer and high-density polyethylene are preferable in terms ofinexpensiveness and formability.

[0024] The polyolefinic resin used for the base layer (A) is preferablyhas a melting point (peak temperature in a DSC curve) of 130 to 210° C.In particular, propylene homopolymer having a melting point (peaktemperature in a DSC curve) of 155 to 174° C., a melt flow rate (JISK-7210) of 0.5 to 10 g/10 minutes and a crystallinity of 45 to 70% ispreferable. For the base layer (A), a single species may be selectedfrom the above polyolefinic resins for independent use, or two or morespecies may be selected therefrom for combined use.

[0025] The inorganic fine powder used for the base layer (A) preferablyhas an average grain size of 0.01 to 10 μm, and more preferably 0.05 to8 μm. The organic filler used for the base layer (A) preferably has anaverage dispersion grain size of 0.01 to 10 μm, and more preferably 0.05to 8 μm.

[0026] Examples of the inorganic fine powder include heavy calciumcarbonate, precipitated calcium carbonate, fired clay, talc, titaniumoxide, barium sulfate, aluminum sulfate, silica, zinc oxide, magnesiumoxide and diatom earth. Surface modified products of such inorganic finepowder are also available. Among these, heavy calcium carbonate,precipitated calcium carbonate, surface modified products of suchcalcium carbonates, clay and diatom earth are preferable in terms ofinexpensiveness and void forming property in the stretching.

[0027] The organic filler is exemplified by polyethylene terephthalate,polybutylene terephthalate, polyamide, polycarbonate, polyethylenenaphthalate, polystyrene, melamine resin, cyclopolyolefin, polyethylenesulfite, polyimide, polyethyl ether ketone and polyphenylene sulfite.Among these, incompatible organic fillers having a higher melting pointor glass transition point than that of the polyolefinic resin to becombined therewith are preferable in terms of void formation.

[0028] For the base layer (A), a single species of the inorganic finepowder or the organic filler may be selected from the above forindependent use, or two or more species may be selected therefrom forcombined use. The case of combined use of two or more species allowsmixed use of the organic filler and the inorganic fine powder.

[0029] As for blend ratio of the polyolefinic resin and the inorganicfine powder or organic filler, the polyolefinic resin accounts for 40 to90 wt %, and the inorganic fine powder or organic filler accounts for 10to 60 wt % of a total. In a more preferable case, the polyolefinic resinaccounts for 60 to 90 wt %, and the inorganic fine powder or organicfiller accounts for 10 to 40 wt % of a total; and in a still morepreferable case, the polyolefinic resin accounts for 65 to 90 wt %, andthe inorganic fine powder or organic filler accounts for 10 to 35 wt %of a total.

[0030] The base layer (A) is preferably such that having a lot of voids.The porosity thereof is preferably 10 to 55%. The porosity of the baselayer (A) is now referred to ratio of sectional area of voids in thebase layer (A) determined by observing a section of the multi-layeredstretched resin film under a scanning electron microscope. Using suchbase layer (A) having a lot of voids is also beneficial in reducingweight of the multi-layered stretched resin film. The voids can beproduced by stretching, where uniaxial stretching and biaxial stretchingare both allowable.

[0031] The thickness of the base layer (A) is preferably 20 to 250 μm,and is more preferably 30 to 200 μm.

[0032] Amorphous Resin-Containing Layer (B)

[0033] The amorphous resin-containing layer (B) of the multi-layeredstretched resin film of the present invention contains 0 to 85 wt % of apolyolefinic resin and 15 to 100 wt % of an amorphous resin.

[0034] There is no special limitation on the species of the polyolefinicresin used for the amorphous resin-containing layer (B) and those listedin the above for the base layer (A) are available. In particular,propylene homopolymer, high-density polyethylene and mixture thereof arepreferable. More specifically, propylene homopolymer having a meltingpoint (peak temperature in a DSC curve) of 155 to 174° C., a melt flowrate (JIS K-7210) of 0.5 to 20 g/10 minutes and a crystallinity of 45 to70% is preferable. Another preferable example available therefor ishigh-density polyethylene having a melting point (peak temperature in aDSC curve) of 120 to 135° C., a melt flow rate (JIS K-6760) of 0.2 to 20g/10 minutes, a crystallinity of 65 to 95%, and a density of 0.945g/cm³or above. The polyolefinic resin used for the amorphousresin-containing layer (B) may be a single species selected from theabove for individual use, or two or more species for combined use.

[0035] The amorphous resin for use in the amorphous resin-containinglayer (B) is preferably such that having a glass transition point of140° C. or below, and more preferably 70 to 140° C. A glass transitionpoint of the amorphous resin lower than 70° C. tends to result inadhesion of the film onto rolls and thus ruin the formability of thefilm, and that higher than 140° C. tends to result in excessiveformation of the voids during the stretching to thereby raise theporosity, which is disadvantageous in that effectively preventing thesolvent attack. When the multi-layered stretched resin film of thepresent invention is produced, the stretching temperature is preferablyset at a temperature higher by 10° C. or more than the glass transitionpoint of the amorphous resin.

[0036] Such amorphous resin is typically exemplified as cycloolefinicresin, atactic polystyrene, petroleum resin, polycarbonate or acrylicresin. These resins may be used individually or in any combinations oftwo or more thereof.

[0037] Among these, cycloolefinic resin is particularly preferable. Thecycloolefinic resin is preferably any one resin selected from the groupcomprising ring-opened polymers derived from cycloolefinic monomerexpressed by general formula (1) below; hydrogenated compounds of suchpolymers or copolymers; and addition polymers of cycloolefinic monomerexpressed by the general formula (1) and ethylene:

[0038] where, “n” denotes 0 or a positive integer, R¹ to R¹²independently represents an atom or a functional group selected from thegroup comprising hydrogen atom, halogen atom and hydrocarbon groups, R⁹to R¹² may be bound with each other to form a monocyclic or polycyclicgroup, where such monocyclic or polycyclic group may have a double bond,and R⁹ and R¹⁰, or R¹¹ and R¹² together may form an alkylidene group.

[0039] As such cycloolefinic monomer, already known monomers disclosedfor example in Japanese Laid-Open Patent Publication Nos. 2-227424,2-276842, 5-97719, 7-41550 and 8-72210 are available. Specific examplesof such cycloolefinic monomer include bicyclo[2.2.1]hepto-2-enederivatives, tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene derivatives,hexacyclo[6.6.1.1^(3,6).1^(10,13).0^(2,7).0^(9,14)]-4-heptadecenederivatives,octacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(12,17)]-5-docosenederivatives, pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecenederivatives, heptacyclo-5-eicosene derivative, heptacyclo-5-heneicosenederivatives, tricyclo[4.3.0.1^(2,5)]-3-decene derivatives,tricyclo[4.4.0.1^(2,5)]-3-undecene derivaives,pentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadecene derivatives,pentacyclopentadecadiene derivatives,pentacyclo[7.4.0.1^(2,5).1^(9,12).0^(8,13)])-3-pentadecene derivatives,heptacyclo[8.7.0.1^(3,6).1^(10,17).1^(12,15).0^(2,7).0^(11,16)]-4-eicosenederivatives,nonacyclo[10.9.1.1^(4,7).1^(13,20).1^(15,18).0^(3,8).0^(2,10).0^(12,21).0^(14,19)]-5-pentacosenederivatives, pentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-hexadecenederivatives,heptacyclo[8.8.0.1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(2,17)]-5-heneicosenederivatives,nonacyclo[10.10.1.1^(5,8).1^(14,21).1^(16,19).0^(2,11).0^(4,9).0^(13,22).0^(15,20)]-5-hexacosenederivatives, 1,4-methano-1,4,4a,9a-teterahydrofluorene derivatives,1,4-methano-1,4,4a,5,10,10a-hexahydroanthracene derivatives, andcyclopentadiene-acenaphthylene adduct.

[0040] More specifically, possible examples thereof includebicyclo[2.2.1]hepto-2-ene derivatives such as bicyclo[2.2.1]hepto-2-ene,6-methylbicyclo[2.2.1]hepto-2-ene,5,6-dimethylbicyclo-[2.2.1]hepto-2-ene,1-methylbicyclo[2.2.1]hepto-2-ene, 6-ethylbicyclo[2.2.1]hepto-2-ene,6-n-butylbicyclo[2.2.1]hepto-2-ene, 6-isobutylbicyclo[2.2.1]hepto-2-eneand 7-methylbicyclo[2.2.1]-hepto-2-ene;tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene derivatives such astetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-methyltetracyclo-[4.4.0.1^(2.5).1^(7,10)]-3-dodecene,8-ethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-propyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-butyl-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isobutyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-hexyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-cyclohexyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-stearyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,5,10-dimethyltetra-cyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,2,10-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8,9-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-ethyl-9-methyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,11,12-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,2,7,9-tri-methyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,9-ethyl-2,7-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,9-isobutyl-2,7-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,9,11,12-trimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,9-ethyl-11,12-dimethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,9-isobutyl-11,12-dimethyl-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,5,8,9,10-tetramethyltetra-cyclo[4.4.0.1^(2,5).1^(7.10)]-3-dodecene,8-ethylidene-9-methyltetra-cyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-ethylidene-9-ethyltetracyclo-[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-ethylidene-9-isopropyltetracyclo-[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-ethylidene-9-butyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-n-propylidenetetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-n-propylidene-9-methyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-n-propylidene-9-ethyltetracyclo[4.4.0.1^(2,5).1^(7,10)1]-3-dodecene,8-n-propylidene-9-isopropyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-n-propylidene-9-butyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isopropylidenetetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isopropylidene-9-methyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isopropylidene-9-ethyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isopropylidene-9-isopropyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-isopropylidene-9-butyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-chlorotetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-bromotetracyclo-(4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-fluorotetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene, and8,9-dichlorotetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene;hexacyclo[6.6.1.1^(3,6).1^(10,13).0^(2,7).0^(9,14)]-4-heptadecenederivatives such ashexacyclo[6.6.1.1^(3,6).1^(10,13).0^(2,7).0^(9,14)]-4-heptadecene,12-methylhexacyclo[6.6.1.1^(3,6).1^(10,13).0^(2,7).0^(9,14)-4-heptadecene,12-ethylhexacyclo[6.6.1.1^(3,6)1.^(10,13).0^(2,7).0^(9,14)]-4-heptadecene,12-isobutylhexacyclo[6.6.1.1^(3,6)1.^(10,13)0.^(2,7).0^(9,14)]-4-heptadecene,and1,6,10-tri-methyl-12-isobutylhexacyclo[6.6.1.1^(3,6).1^(10,13).0^(2,7).0^(9,14)]-4-hepta-decene;octacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(12,17)]-5-docosenederivatives such asoctacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(12,17)]-5-docosene,15-methyloctacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).1^(13,16).^(3,8).0^(12,17)]-5-docosene,and15-ethyloctacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(2,17)]-5-docosene;pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene derivatives suchas pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene,1,3-di-methylpentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene,1,6-dimethyl-pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene and15,16-dimethyl-pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene;heptacyclo-5-eicosene derivatives or heptacyclo-5-heneicosenederivatives such asheptacyclo[8.7.0.1^(2,9).1^(4,7).1^(11,17).0^(3,8).0^(12,16)]-5-eicoseneandheptacyclo[8.8.0.1^(2,9).1^(4,7).1^(11,18).0^(3,8).0^(12,17)]-5-heneicosene;tricyclo[4.3.0.1^(2,5)]-3-decene derivatives such astricyclo[4.3.0.1^(2,5)]-3-decene,2-methyltricyclo[4.3.0.1^(2,5)]-3-decene and5-methyltricyclo[4.3.0.1^(2,5)]-3-decene;tricyclo[4.4.0.1^(2,5)]-3-undecene derivatives such astricyclo[4.4.0.1^(2,5)]-3-undecene and10-methyltricyclo[4.4.0.1^(2,5)]-3-undecene;pentacyclo[6.5.1.1^(3,6)0.^(2,7).0^(9,13)]-4-pentadecene derivativessuch as pentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadecene,1,3-dimethylpentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadecene,1,6-di-methylpentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadeceneand14,15-di-methylpentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadecene;diene compounds such aspentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4,10-pentadecadiene;pentacyclo[7.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-pentadecene derivativessuch as pentacyclo[7.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-pentadecene andmethyl-substitutedpentacyclo[7.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-pentadecene;heptacyclo-[8.7.0.1^(3,6).1^(10,17).1^(12,15).0^(2,7).0^(11,16)]-4-eicosenederivatives such asheptacyclo[8.7.0.1^(3,6).1^(10,17).1^(12,15).0^(2,7).0^(11,16)]-4-eicoseneand dimethyl-substitutedheptacyclo[8.7.0.1^(3,6).1^(10,17).1^(12,15).0^(2,7).0^(11,16)]-4-eicosene;nonacyclo[10.9.1.1^(4,7).1^(13,20).1^(15,18).^(3,8).0^(2,10).0^(12,21).0^(14,19)]-5-pentacosenederivatives such asnonacyclo[10.9.1.1^(4,7).1^(13,20).1^(15,18).0^(3,8).0^(2,10).0^(12,21).0^(14,19)]-5-pentacoseneand trimethyl-substitutednonacyclo[10.9.1.1^(4,7).1^(13.20).1^(15,18).0^(3,8)0^(2,10).0^(12,21).0^(14,19)]-5-pentacosene;pentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-hexadecene derivativessuch as pentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-hexadecene,11-methylpentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-hexadecene,11-ethylpentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-3-hexadecene and10,11-dimethylpentacyclo[8.4.0.1^(2,5).1^(9,12).0^(8,13)]-5-hexadecene;heptacyclo[8.8.0.1^(4,7).1^(11,18).1^(13.16).0^(3,8).0^(2,17)]-5-heneicosenederivatives such asheptacyclo[8.8.0.1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(12,17)]-5-heneicosene,15-methylheptacyclo[8.80.1^(4,7).1^(11,18).1^(13,16).0^(3,8).0^(12,17)]-5-heneicosene andtrimethylheptacyclo[8.8.0.1^(4,7).1^(11,18).1^(13.16).0^(3,8.).0^(12,17)]-5-heneicosene;nonacyclo[10.10.1.1^(5,8).1^(14,21).1^(16.19).0^(2,11).0^(4,9).0^(13,22).0^(15,20)]-6-hexacosenederivative such asnonacyclo[10.10.1.1^(5,8).1^(14,21).1^(16,19).0^(2,11).0^(4,9).0^(13,22).0^(15,20)]-6-hexacosene;pentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4,11-pentadecadiene,methyl-substitutedpentacyclo-[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4,11-pentadecadiene,methyl-substitutedpentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4,11-pentadecadiene,methyl-substitutedpentacyclo[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4,11-pentadecadiene,trimethyl-substitutedpentacyclo[4.7.0.1^(2,5).0^(8,13).1^(9,12)]-3-pentadecene,pentacyclo[4.7.0.1^(2,5).0^(8,13).1^(9,12)]-3,10-pentadecadiene,methyl-substitutedpentacyclo[4.7.0.1^(2,5).0^(8,13).1^(9,12)]-3,10-pentadecadiene,methyl-substitutedpentacyclo[4.7.0.1^(2,5).0^(8,13).1^(9,12)]-3,10-pentadecadiene,methyl-substitutedpentacyclo[4.7.0.1^(2,5).0^(8,13)1.^(9,12)]-3,10-pentadecadiene,methyl-substitutedheptacyclo[7.8.0.1^(3,6).0^(2,7).1^(10,17).0^(11,16).1^(12,15)]-4-eicosene,trimethyl-substitutedheptacyclo-[7.8.0.1^(3,6).0^(2,7).1^(10,17).0^(11,16).1^(12,15)]-4-eicosene,tetramethyl-substitutedheptacyclo[7.8.0.1^(3,6).0^(2,7).1^(10,17).0^(11,16).1^(12,15)]-4-eicosene,tricyclo[4.3.0.1^(2,5)]-3,7-decadiene (i.e., dicyclopentadiene),2,3-dihydrodicyclopentadiene, 5-phenylbicyclo[2.2.1]hepto-2-ene (i.e.,5-phenyl2-norbornen), 5-methyl-5-phenylbicyclo[2.2.1]hepto-2-ene,5-benzylbicyclo[2.2.1]hepto-2-ene, 5-tolylbicyclo[2.2.1]hepto-2-ene,5-(ethylphenyl)-bicyclo[2.2.1]hepto-2-ene,5-(isopropyl-phenyl)-bicyclo[2.2.1]hepto-2-ene,8-phenyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-methyl-8-phenyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-benzyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-tolyl-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(ethylphenyl)-tetra-cyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(isopropylphenyl)-tetracyclo-[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8,9-diphenyltetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(biphenyl)-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(â-naphthyl)-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(α-naphthyl)-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,8-(anthracenyl)-tetracyclo[4.4.0.1^(2,5).1^(7,10)]-3-dodecene,11-phenylhexacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-heptadecene,6-(α-naphthyl)-bicyclo[2.2.1]-hepto-2-ene,5-(anthracenyl)-bicyclo[2.2.1]-hepto-2-ene,5-(bi-phenyl)-bicyclo[2.2.1]-hepto-2-ene,5-(â-naphthyl)-bicyclo[2.2.1]-hepto-2-ene,5,6-diphenylbicyclo[2.2.1]-hepto-2-ene, 9-(2-norbornen-5-yl)-carbazoleand 1,4-methano-1,4,4a,4b,5,8,8a,9a-octa-hydrofluorene compounds;1,4-methano-1,4,4a,9a-tetrahydrofluorene compounds such as1,4-methano-1,4,4a,9a-tetrahydrofluorene,1,4-methano-8-methyl-1,4,4a,9a-tetrahydrofluorene,1,4-methano-8-chloro-1,4,4a,9a-tetrahydrofluorene and1,4-methano-8-bromo-1,4,4a,9a-tetrahydrofluorene;1,4-methano-1,4,4a,9a-tetrahydrodibenzofuran compounds;1,4-methano-1,4,4a,9a-tetrahydrocarbazole compounds such as1,4-methano-1,4,4a,9a-tetrahydrocarbazole and1,4-methano-9-phenyl-1,4,4a,9a-tetrahydrocarbazole;1,4-methano-1,4,4a,5,10,10a-hexahydroanthracene compounds such as1,4-methano-1,4,4a,5,10,10a-hexahydroanthracene;7,10-methano-6b,7,10,10a-tetrahydrofluoranthene compounds;cyclopentadiene-acenaphthylene adduct further added withcyclopentadiene,11,12-benzo-pentacyclo-[6.5.1.1^(3,6).0^(2,7).0^(9,13)]-4-pentadecene,11,12-benzo-pentacyclo[6.6.1.1^(3,6).0^(2,7).0^(9,14)]-4-hexadecene,14,15-benzo-heptacyclo[8.7.0.1^(2,9).1^(4,7).1^(11,17).0^(3,8).0^(12,16)]-5-eicoseneand cyclopentadiene-acenaphthylene adduct. These cycloolefinic monomersare available individually, or in any combinations of two or morethereof.

[0041] The hydrogenated compounds of the ring-opened polymer of thecycloolefin can be obtained by techniques such as those disclosed forexample in Japanese Laid-Open Patent Publication Nos. 60-26024,63-218727 and 63-23201, by which the cycloolefin is polymerizedtypically using a polymerization catalyst comprising a metal compound,and then hydrogenated by well-known methods typically using apolymerization catalyst generally used for hydrogenation of olefincompounds.

[0042] Production method of a random copolymer with ethylene istypically found in Japanese Laid-Open Patent Publication No. 60-168708,in which the polymerization is proceeded using a catalyst comprising avanadium compound and a halogen-containing, organo-aluminum compound.The molar fraction of ethylene in such case is preferably 40 to 90%.

[0043] As for the blend ratio of the polyolefinic resin and theamorphous resin in the amorphous resin-containing layer (B), thepolyolefinic resin accounts for 0 to 85 wt %, and the amorphous resinaccounts for 15 to 100%. The ratio of the amorphous resin less than 15wt % will degrade the preventive effect against the solvent attack. Apreferable blend ratio is such that containing the polyolefinic resin inan amount of 20 to 80 wt %, and the amorphous resin in an amount of 20to 80 wt %.

[0044] The porosity of the amorphous resin-containing layer (B) must be5% or below, and is more preferably 3% or below. The porosity of theamorphous resin-containing layer (B) is now referred to ratio ofsectional area of voids in the amorphous resin-containing layer (B)determined by observing section of the multi-layered stretched resinfilm under a scanning electron microscope. The porosity exceeding 5%will result in penetration of the vehicle (in particularhigh-boiling-point, petroleum-base solvent such as mineral oil) in theoffset printing ink through the voids to reach the base layer (A), tothereby swell the entire film, which is so-called solvent attack. It isalso allowable to add an inorganic fine powder or an organic filler tothe amorphous resin-containing layer (B) so far as the porosity iscontrolled at 5% or below.

[0045] While being not adhering to any theories, it is supposed that thesurface waving or curling is successfully avoided because the amorphousresin added to the amorphous resin-containing layer (B) can effectivelysuppress the swelling of the amorphous resin-containing layer (B) per seascribable to the vehicle (in particular high-boiling-point,petroleum-base solvent such as mineral oil) in the offset printing ink,and because the scarcity of the voids in the amorphous resin-containinglayer (B) makes it difficult for the vehicle to penetrate such amorphousresin-containing layer (B) to reach the base layer (A), both of whicheffectively prevent the multi-layered resin film per se from beingswollen. Thus the multi-layered stretched resin film of the presentinvention allows use of the general-purpose, quick-drying (drying oiltype) offset printing ink.

[0046] The thickness of the amorphous resin-containing layer (B) ispreferably 1 to 100 μm.

[0047] Surface Layer (C)

[0048] There is no special limitation on the species of the polyolefinicresin used for the surface layer (C), and those listed in the above forthe base layer (A) are available. The polyolefinic resin used for thesurface layer (C) is preferably has a melting point (peak temperature ina DSC curve) of 130 to 210° C. In particular, propylene homopolymerhaving a melting point (peak temperature in a DSC curve) of 155 to 174°C., a melt flow rate (JIS K-7210) of 0.5 to 20 g/10 minutes and acrystallinity of 45 to 70% is preferable. For the surface layer (C), asingle species may be selected from the above polyolefinic resins listedfor the base layer (A) for independent use, or two or more species maybe selected therefrom for combined use.

[0049] The inorganic fine powder used for the surface layer (C)preferably has an average grain size of 0.01 to 6 μm, more preferably0.05 to 4 μm, and still more preferably 0.07 to 2 μm. The organic fillerused for the surface layer (C) preferably has an average dispersiongrain size of 0.01 to 6 μm, more preferably 0.05 to 4 μm, and still morepreferably 0.07 to 2 μm.

[0050] Examples of the inorganic fine powder include heavy calciumcarbonate, precipitated calcium carbonate, fired clay, talc, titaniumoxide, barium sulfate, aluminum sulfate, silica, zinc oxide, magnesiumoxide and diatom earth. Surface modified products of the above inorganicfine powders using various surface modifiers are also exemplified. Amongthese, heavy calcium carbonate, precipitated calcium carbonate, surfacemodified products of these calcium carbonates, clay and diatom earth arepreferable in terms of inexpensiveness and void forming property in thestretching. Still more preferable are surface modified products of heavycalcium carbonate and precipitated calcium carbonate using varioussurface modifiers. Examples of the surface modifiers include resin acid,aliphatic acid, organic acid, sulfate ester type anionic surfactant,sulfonate type anionic surfactant, petroleum resin acid, and sodium,potassium or ammonium salts thereof, or aliphatic esters, or aliphaticesters or resinate esters thereof, wax and paraffin. It is alsopreferable to use nonionic surfactant, diene-base polymer, titanatecoupling agents, silane coupling agents and phosphate coupling agents.Examples of the sulfate-ester-type anionic surfactant include long-chainalcohol sulfate ester, polyoxyethylenealkylether sulfate ester, sulfatedoil, and sodium or potassium salts thereof; examples of thesulfonate-type anionic surfactant include alkylbenzenesulfonic acid,alkylnaphthalenesulfonic acid, paraffinsulfonic acid, α-olefinsulfonicacid, alkylsulfosuccinic acid, and sodium or potassium salts thereof.Examples of the aliphatic acid include caproic acid, caprylic acid,pelargonic acid, capric acid, undecanoic acid, lauric acid, myristicacid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleicacid, linolenic acid and eleostearic acid; examples of the organic acidinclude maleic acid and sorbic acid; examples of diene-base polymerinclude polybutadiene and isoprene; examples of nonionic surfactantinclude polyethyleneglycol ester type surfactant. These surfacemodifiers maybe used individually or in any combinations of two or morethereof.

[0051] The organic filler is exemplified by polyethylene terephthalate,polybutylene terephthalate, polyamide, polycarbonate, polyethylenenaphthalate, polystyrene, melamine resin, cyclopolyolefin, polyethylenesulfite, polyimide, polyethyl ether ketone and polyphenylene sulfite.Among these, incompatible organic fillers having a higher melting pointor glass transition point than that of the polyolefinic resin to becombined therewith are preferable in terms of void formation.

[0052] For the surface layer (C), a single species of the inorganic finepowder or the organic filler may be selected from the above forindependent use, or two or more species may be selected therefrom forcombined use. The case of combined use of two or more species allowsmixed use of the organic filler and the inorganic fine powder.

[0053] The thickness of the surface layer (C) is preferably 1 to 100 μm,and is more preferably 1.5 to 50 μm.

[0054] Production of Multi-Layered Stretched Resin Film

[0055] There is no special limitation on the production method of themulti-layered stretched resin film of the present invention. Any filmsproduced according to any methods will be included within the scope ofthe present invention provided that they satisfy the conditionsdescribed in Claims. The following paragraphs deal with preferablemethods for producing the multi-layered stretched resin film of thepresent invention.

[0056] The multi-layered stretched resin film of the present inventioncan be produced by first kneading under fusion a resin composition forthe base layer (A), extruding the kneaded resin in a sheet form;stretching the sheet 4 to 7-fold in the longitudinal direction effectedby difference in the peripheral speeds of a number of roller groups;laminating the stretched sheet with a sheet of the amorphousresin-containing layer (B) and with, as required, the surface layer (C),resin compositions of which being previously kneaded separately underfusion, so as to obtain a desired layer constitution; stretching thelaminate 4 to 12-fold using a tenter in the transverse direction at atemperature lower by 5 to 35° C. than the melting point of the olefinicpolymer in the base layer, and higher by 10° C. or more than the glasstransition point of the amorphous resin; and then subjecting theresultant film to annealing and cooling.

[0057] Another allowable process relates to that the resin compositionsfor the base layer (A), the amorphous resin-containing layer (B), andthe surface layer (C) employed as necessary, are separately kneadedunder fusion, the compositions are extruded in a sheet form so as toobtain a desired layer constitution, the extruded sheet is stretched 4to 7-fold in the longitudinal direction effected by difference in theperipheral speeds of a number of roller groups at a temperature higherby 10° C. or more than the glass transition point of the amorphousresin; the resultant sheet was further stretched 4 to 12-fold using atenter in the transverse direction at a temperature lower by 5 to 35° C.than the melting point of the polyolefinic polymer in the base layer,and higher by 10° C. or more than the glass transition point of theamorphous resin; and the resultant film is then subjected to annealingand cooling. Still another possible process relates to that the resincompositions for the base layer (A), the amorphous resin-containinglayer (B), and the surface layer (C) employed as necessary, areseparately kneaded under fusion, the compositions are extruded in asheet form so as to obtain a desired layer constitution, the extrudedsheet is stretched 4 to 7-fold in the longitudinal direction effected bydifference in the peripheral speeds of a number of roller groups at atemperature higher by 10° C. or more than the glass transition point ofthe amorphous resin; and the resultant film is then subjected toannealing and cooling.

[0058] There is no specific limitation on the layer constitution of themulti-layered stretched resin film of the present invention providedthat the film includes a structure in which the amorphousresin-containing layer (B) is provided on one side of the base layer(A). The amorphous resin-containing layer (B) may be provided on eitherside of the base layer (A) or on both sides of the base layer (A). Inthe present invention, it is also preferable that the surface layer (C)is provided on at least one side of a stack comprising the base layer(A) and the amorphous resin-containing layer (B) provided on at leastone side of such base layer (A). The surface layer (C) may be providedon either side of the stack or on both sides of the stack.

[0059] The multi-layered stretched resin film of the present inventionpreferably has an opacity (measured in compliance with JIS P-8138) of70% or above. An opacity smaller than 70% tends to fail in obtainingpaper texture. The thickness of the multi-layered stretched resin filmof the present invention is preferably 30 to 450 μm.

[0060] Particularly preferable layer constitution of the multi-layeredstretched resin film of the present invention is such that expressed as(C)/(B)/(A)/(B)/(C), (C)/(B)/(A)/(B), (C)/(B)/(A)/(C), (C)/(B)/(A),(B)/(A)/(B), (B)/(A)/(C) or (B)/(A). It should now be noted thatnotation “(B)/(A)” represents a constitution in which the amorphousresin-containing layer (B) is provided on the base layer (A). Anadditional layer other than the base layer (A), amorphousresin-containing layer (B) and surface layer (C) can be provided betweenarbitrary adjacent layers. Such additional layer can properly beselected depending on applications and desired functions of themulti-layered stretched resin film.

[0061] For example, it is preferable for enhancing paper-like texture ofthe multi-layered stretched resin film to provide a propylene resin-baseintermediate layer containing 8 to 55 wt % of an inorganic fine powderbetween the base layer (A) and the amorphous resin-containing layer (B)or the surface layer (C). It is also preferable to add to suchintermediate layer a small amount of a low-melting-point resin such aspropylene-base copolymer, high-density polyethylene, polystyrene andethylene-vinyl acetate copolymer for the purpose of improving thestretching property.

[0062] In order to improve the offset printability, it is also allowableto modify the surface of the multi-layered stretched resin film bycorona discharge treatment, flame treatment or coating of awater-soluble primer selected from the group consisting of ethyleneimineadducts such as polyethyleneimine, butylated polyethyleneimine,hydroxypropylated polyethyleneimine, hydroxyethylated polyethyleneimine,2,3-dihydroxypropylated polyethyleneimine, poly(ethyleneimine-urea), andpolyamine polyamide; epichlorohydrin adducts such as polyaminepolyamide; and ternary or quaternary nitrogen-containing acrylic resin.

[0063] In order to further improve the offset printing suitability ofthe multi-layered stretched resin film of the present invention, apigment coated layer can be provided on at least one plane to beprinted. Such pigment coated layer can be formed by pigment coatingaccording to general coating procedures for producing coated paper.

[0064] A pigment coating material used for the pigment coating isexemplified as a latex used for producing general coated layer, whichcontains 30 to 80 wt % of a pigment such as clay, talc, calciumcarbonate, magnesium carbonate, aluminum hydroxide, silica, calciumsilicate and plastic pigment, and 20 to 70 wt % of an adhesive.

[0065] Examples of the adhesive available herein include latex such asSBR (styrene-butadiene copolymeric rubber), MBR (methacrylate-butadienecopolymeric rubber); acrylic emulsion, starch, PVA (polyvinyl alcohol),CMC (carboxymethyl cellulose) and methyl cellulose.

[0066] Such pigment coating material may further be added with adispersion aid typically comprising a special sodium polycarboxylatesuch as acrylic acid/sodium acrylate copolymer, or with a crosslinkingagent such as polyamide-urea-base resin. Such pigment coating agent isgenerally used in a form of a water-soluble coating agent having a solidconcentration of 15 to 70 wt %, and more preferably 35 to 65 wt %.

[0067] Methods for coating such coating agent onto the multi-layeredstretched resin film is exemplified as gravure coating, Mayer barcoating, roll coating, blade coating or size press coating. The amountof coating is generally 0.01 to 20 g/m², and more preferably 0.1 to 15g/m².

[0068] Next, the present invention will further be detailed referring tospecific Examples, Comparative Examples and Test Examples. Materials,amount of use thereof, ratio of use, operations or the like can properlybe modified without departing from the spirit of the present invention.Thus it is to be understood that the present invention is by no meanslimited to the specific examples explained below.

EXAMPLES 1 TO 19, AND COMPARATIVE EXAMPLES 2 AND 3

[0069] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to themixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. The composition (A) was kneaded under fusion in an extruder set at270° C., extruded from a die in a sheet form, and then cooled using acooling apparatus to thereby produce a non-stretched sheet. The sheetwas re-heated up to 140° C. and stretched five-fold in the longitudinaldirection effected by difference in the peripheral speeds of a number ofroller groups.

[0070] A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 3 in an amount againlisted in Table 3. A composition (C) was separately prepared by mixingan inorganic fine powder listed in Table 3 in an amount again listed inTable 3 with a propylene homopolymer having an MFR of 4.0 g/10 minutes(peak melting temperature=160° C., melting completion temperature=167°C.). A composition (D) was separately prepared by mixing 50 wt % of apropylene homopolymer having an MFR of 4.0 g/10 minutes (peak meltingtemperature=160° C., melting completion temperature=167° C.) with 50 wt% of a calcium carbonate having an average grain size of 1.5 μm. Thecompositions (B), (C) and (D) were individually kneaded under fusion inseparate extrusion machines set at 270° C., stacked within a single die,co-extruded from the die, and the obtained stacked sheet was laminatedon one side of the foregoing 5-fold stretched sheet (A) so as to attaina constitution expressed as (C)/(B)/(D)/(A). The same stacked sheet wasalso laminated on the opposite side to thereby obtain seven-layeredconstitution expressed as (C)/(B)/(D)/(A)/(D)/(B)/(C).

[0071] The seven-layered stack was heated to 155° C., stretched 7.5-foldin the transverse direction using a tenter, and annealed at 163° C. tothereby obtain a seven-layered film. The surface of such seven-layeredfilm was subjected to corona discharge treatment to thereby obtain aseven-layered, stretched resin film having a constitution expressed as(C)/(B)/(D)/(A)/(D)/(B)/(C) (in 4 μm/4 μm/22 μm/70 μm/22 μm/4 μm/4 μmthick).

[0072] Such procedures were repeated while changing the species and theamount of use of the amorphous resin and polyolefinic resin for theamorphous resin-containing layer (B) and the inorganic fine powder forthe surface layer (C) as listed in Table 3, to thereby obtain 21 typesof the multi-layered stretched resin films according to Examples 1 to 19and Comparative Examples 2 and 3. Details of the amorphous resins,polyolefinic resins and inorganic fine powders used herein are as listedin Table 2.

COMPARATIVE EXAMPLE 1

[0073] A seven-layered stretched resin film was obtained similarly asdescribed in Example 1, except that the amorphous resin-containing layer(B) is altered to a layer comprising 55 wt % of a propylene homopolymerhaving an MFR of 5.0 g/10 minutes (peak melting temperature=160° C.,melting completion temperature=167° C.) and 45 wt % of calcium carbonatehaving an average grain size of 1.25 μm.

EXAMPLE 20

[0074] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to suchmixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. The composition (A) was kneaded under fusion in an extruder set at270° C., extruded from a die in a sheet form, and then cooled using acooling apparatus to thereby produce a non-stretched sheet. The sheetwas re-heated up to 140° C. and stretched five-fold in the longitudinaldirection effected by difference in the peripheral speeds of a number ofroller groups.

[0075] A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 3 in an amount againlisted in Table 3. A composition (C) was separately prepared by mixingan inorganic fine powder listed in Table 3 in an amount again listed inTable 3 with a propylene homopolymer having an MFR of 4.0 g/10 minutes(peak melting temperature=160° C., melting completion temperature=167°C.). The compositions (B) and (C) were individually kneaded under fusionin separate extrusion machines set at 270° C., stacked within a singledie, co-extruded from the die, and the obtained stacked sheet waslaminated on one side of the foregoing 5-fold stretched sheet (A) so asto direct the surface layer (C) outward. The same stacked sheet was alsolaminated on the opposite side so as to direct the surface layer (C)outward, to thereby obtain a five-layered stack.

[0076] The five-layered stack was heated to 155° C., stretched 7.5-foldin the transverse direction using a tenter, and annealed at 163° C. tothereby obtain a five-layered film. The surface of such five-layeredfilm was subjected to corona discharge treatment to thereby obtain afive-layered, stretched resin film having a constitution expressed as(C)/(B)/(A)/(B)/(C) (in 15 μm/15 μm/70 μm/15 μm/15 μm thick).

EXAMPLE 21

[0077] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to suchmixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 3 in an amount againlisted in Table 3. A composition (C) was separately prepared by mixingan inorganic fine powder listed in Table 3 in an amount again listed inTable 3 with a propylene homopolymer having an MFR of 4.0 g/10 minutes(peak melting temperature=160° C., melting completion temperature=167°C.). The compositions (A), (B) and (C) were individually kneaded underfusion in separate extrusion machines set at 270° C., stacked within asingle die so as to attain a layer constitution of (C)/(B)/(A)/(B)/(C),co-extruded from the die, and then cooled using a cooing apparatus tothereby produce a non-stretched sheet. The sheet was heated to 155° C.,and stretched five-fold in the longitudinal direction effected bydifference in the peripheral speeds of a number of roller groups. Thesheet was then again heated to 155° C., stretched 7.5-fold in thetransverse direction using a tenter, and annealed at 163° C. to therebyobtain a five-layered film. The surface of such five-layered film wassubjected to corona discharge treatment to thereby obtain afive-layered, stretched resin film having a constitution expressed as(C)/(B)/(A)/(B)/(C) (in 5 μm/5 μm/50 μm/5 μm/5 μm thick).

EXAMPLE 22

[0078] A composition (A) was prepared by mixing 72 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to suchmixture 20 wt % of calcium carbonate having an average grain size of 1.5μm. A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 3 in an amount againlisted in Table 3. A composition (C) was separately prepared by mixingan inorganic fine powder listed in Table 3 in an amount again listed inTable 3 with a propylene homopolymer having an MFR of 4.0 g/10 minutes(peak melting temperature=160° C., melting completion temperature=167°C.). The compositions (A), (B) and (C) were individually kneaded underfusion in separate extrusion machines set at 270° C., co-extruded from asingle die into a sheet form so as to attain a layer constitution of(C)/(B)/(A)/(B)/(C), and then cooled using a cooling apparatus tothereby produce a non-stretched sheet. The sheet was heated to 140° C.,and stretched five-fold in the longitudinal direction effected bydifference in the peripheral speeds of a number of roller groups. Thesheet was then annealed at 145° C. to thereby obtain a five-layeredfilm. The surface of such five-layered film was subjected to coronadischarge treatment to thereby obtain a five-layered, stretched resinfilm having a constitution expressed as (C)/(B)/(A)/(B)/(C) (in 15 μm/15μm/70 μm/15 μm/15 μm thick).

EXAMPLES 23 TO 34, AND COMPARATIVE EXAMPLES 5 AND 6

[0079] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to themixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. The composition (A) was kneaded under fusion in an extruder set at270° C., extruded from a die in a sheet form, and then cooled using acooling apparatus to thereby produce a non-stretched sheet. The sheetwas re-heated up to 140° C. and stretched five-fold in the longitudinaldirection effected by difference in the peripheral speeds of a number ofroller groups.

[0080] A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 4 in an amount againlisted in Table 4. A composition (D) was separately prepared by mixing50 wt % of a propylene homopolymer having an MFR of 4.0 g/10 minutes(peak melting temperature=160° C., melting completion temperature=167°C.) with 50 wt % of a calcium carbonate having an average grain size of1.5 μm. The compositions (B) and (D) were individually kneaded underfusion in separate extrusion machines set at 270° C., stacked within asingle die, co-extruded from the die, and the obtained stacked sheet waslaminated on one side of the foregoing 5-fold stretched sheet (A) so asto direct the amorphous resin-containing layer (B) outward. The samestacked sheet was also laminated on the opposite side so as to directthe amorphous resin-containing layer (B) outward, to thereby obtainfive-layered stack.

[0081] The five-layered stack was heated to 155° C., stretched 7.5-foldin the transverse direction using a tenter, and annealed at 163° C. tothereby obtain a five-layered film. The surface of such five-layeredfilm was subjected to corona discharge treatment to thereby obtain afive-layered, stretched resin film having a constitution expressed as(B)/(D)/(A)/(D)/(B) (in 5 μm/25 μm/70 μm/25 μm/5 μm thick).

[0082] Such procedures were repeated while changing the species and theamount of use of the amorphous resin and polyolefinic resin for theamorphous resin-containing layer (B) as listed in Table 4, to therebyobtain 14 types of the multi-layered stretched resin films according toExamples 23 to 34 and Comparative Examples 5 and 6. Details of theamorphous resins, polyolefinic resins and inorganic fine powders usedherein are as listed in Table 2.

COMPARATIVE EXAMPLE 4

[0083] A five-layered stretched resin film was obtained similarly asdescribed in Example 23, except that the amorphous resin-containinglayer (B) is altered to a layer comprising 55 wt % of a propylenehomopolymer having an MFR or 5.0 g/10 minutes (peak meltingtemperature=160° C., melting completion temperature=167° C.) and 45 wt %of calcium carbonate having an average grain size of 1.5 μm.

EXAMPLE 35

[0084] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to themixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. The composition (A) was kneaded under fusion in an extruder set at270° C., extruded from a die in a sheet form, and then cooled using acooling apparatus to thereby produce a non-stretched sheet. The sheetwas re-heated up to 140° C. and stretched five-fold in the longitudinaldirection effected by difference in the peripheral speeds of a number ofroller groups.

[0085] A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 4 in an amount againlisted in Table 4. The composition (B) was kneaded under fusion in anextrusion machine set at 270° C., extruded from the die into a sheetform, and the obtained sheet was laminated on one side of the foregoing5-fold stretched sheet (A). The same sheet was also laminated on theopposite side to thereby obtain a three-layered stack.

[0086] The three-layered stack was heated to 155° C., stretched 7.5-foldin the transverse direction using a tenter, and annealed at 163° C. tothereby obtain a three-layered film. The surface of such three-layeredfilm was subjected to corona discharge treatment to thereby obtain athree-layered, stretched resin film having a constitution expressed as(B)/(A)/(B) (in 15 μm/80 μm/15 μm thick).

EXAMPLE 36

[0087] A composition (A) was prepared by mixing 80 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to themixture 12 wt % of calcium carbonate having an average grain size of 1.5μm. A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 4 in an amount againlisted in Table 4. The compositions (A) and (B) were individuallykneaded under fusion in separate extrusion machines set at 270° C.,stacked within a single die into a sheet form so as to attain a layerconstitution of (B)/(A)/(B), co-extruded from the die, and then cooledusing a cooling apparatus to thereby produce a non-stretched sheet. Thesheet was heated to 155° C., and stretched 5-fold in the longitudinaldirection effected by difference in the peripheral speeds of a number ofroller groups. The sheet was then again heated to 155° C., stretched7.5-fold in the transverse direction using a tenter, and annealed at163° C. to thereby obtain a three-layered film. The surface of suchthree-layered film was subjected to corona discharge treatment tothereby obtain a three-layered, stretched resin film having aconstitution expressed as (B)/(A)/(B) (in 5 μm/50 μm/5 μm thick).

EXAMPLE 37

[0088] A composition (A) was prepared by mixing 72 wt % of a propylenehomopolymer having a melt flow rate (MFR) of 0.8 g/10 minutes (peakmelting temperature=160° C., melting completion temperature=167° C.) and8 wt % of a high-density polyethylene, and by further adding to themixture 20 wt % of calcium carbonate having an average grain size of 1.5μm. A composition (B) was separately prepared by mixing an amorphousresin with a polyolefinic resin listed in Table 4 in an amount againlisted in Table 4. The compositions (A) and (B) were individuallykneaded under fusion in separate extrusion machines set at 270° C.,extruded from a single die into a sheet form so as to attain a layerconstitution of (B)/(A)/(B), and then cooled using a cooling apparatusto thereby produce a non-stretched sheet. The sheet was heated to 140°C., stretched five-fold in the longitudinal direction effected bydifference in the peripheral speeds of a number of roller groups, andannealed at 145° C. to thereby obtain a three-layered film. The surfaceof such three-layered film was subjected to corona discharge treatmentto thereby obtain a three-layered, stretched resin film having aconstitution expressed as (B)/(A)/(B) (in 15 μm/100 μm/15 μm thick).

EXAMPLES 38 TO 47

[0089] On one side of the multi-layered stretched resin film obtained inExamples 25, 26, 28, and 31 to 37, a water-soluble coating material wascoated so as to form a coated film of 10 g/m², where the coatingmaterial comprises 50 wt % of precipitated calcium carbonate (E)(product of Shiraishi Kogyo K.K., Brilliant-15), 10 wt % of kaolin gray(F) (product of Engelhard Corporation, Ultrawhite-90), 35 wt % ofacryl/styrene copolymer emulsion (G) (product of Hoechst Gosei K.K.,Movinyl 8010) and 5 wt % of specialized modified polyvinyl alcohol (H)(product of Nippon Synthetic Chemical Industry Co., Ltd., GohsephimarZ-100), and was then dried at 105° C. for 1 minute to thereby obtain acoated film.

[0090] The inorganic powders (E) and (F) herein were added with, as adispersion aid, 0.5 weight parts of specialized sodium polycarboxylate(product of Kao Corporation, Poiz 520) per 100 weight parts of suchpowders (E) and (F), and the polyvinyl alcohol (H) was added with, as acrosslinking agent, 10 weight parts of polyamide urea-base resin(product of Sumitomo Chemical, Sumirez Resin 633).

TEST EXAMPLES

[0091] The multi-layered stretched resin films obtained in Examples 1 to47 and Comparative Examples 1 to 6 were subjected to measurements ofporosity, opacity and smoothness according to the procedures describedbelow, and the offset printability (curl height, waving after printingwith a practical printing machine, and ink drying property) wasevaluated. Results were shown in Tables 3, 4 and 5.

[0092] (1) Porosity

[0093] Section of the multi-layered stretched film was observed under ascanning electron microscope, and a ratio of area of voids in theamorphous resin-containing layer (B) was estimated, which was referredto as porosity (%) of the amorphous resin-containing layer (B).

[0094] (2) Opacity

[0095] Opacity was measured in compliance with JIS P-8138.

[0096] (3) Smoothness

[0097] The smoothness of the surface layer (C) of the films obtained inExamples 1 to 22 and Comparative Examples 1 to 3 was measured incompliance with JIS P-8119.

[0098] (4) Curl Height

[0099] The entire surface of the multi-layered stretched resin film tobe evaluated was subjected to printing with a dry type offset printingink (product of T&K TOKA Company, Supertech Magenta) in a transferamount of 1.5 g/m² using a printing suitability tester (product ofIshikawajima Industrial Machines, Model RI-2). The obtained printedmatter was cut into a 10 cm×10 cm piece and allowed to stand on a flattable 2 for a day. Curl height of the printed matter 1 as shown in FIG.1 was measured at four corners thereof and an average value was found.

[0100] (5) Generation of Surface Waving

[0101] The multi-layered stretched resin film to be evaluated wassubjected to 1,000-sheet continuous printing with dry type offsetprinting inks of four colors (product of T&K TOKA Company, SupertechBlack, Cyan, Magenta and Yellow) in a transfer amount of 1.5 g/m² foreach color using a four-color offset printing machine (product ofMitsubishi Heavy Industries, Ltd., Model OF-4). The obtained printedmatters were allowed to stand while being stacked in a columnar form.After the inks were dried, waving of the film caused by film areas withor without applied inks was judged by sensory evaluation. Evaluationcriteria are as follows:

[0102] ◯: no waving

[0103] Δ: waving recognizable

[0104] X: serious waving

[0105] (6) Ink Drying Property

[0106] The multi-layered stretched resin film to be evaluated wassubjected to 1,000-sheet continuous printing with dry type offsetprinting inks of four colors (product of T&K TOKA Company, SupertechBlack, Cyan, Magenta and Yellow) in a transfer amount of 1.5 g/m² foreach color using a four-color offset printing machine (product ofMitsubishi Heavy Industries, Ltd., Model OF-4). The obtained printedmatters were allowed to stand while being stacked in a columnar form,and sampled for every predetermined time period to be confirmed for thedry status. Evaluation criteria for the ink drying property are asfollows:

[0107] 5: very rapid

[0108] 4: rapid

[0109] 3: non-problematic level

[0110] 4: a little slow and problematic

[0111] 5: very slow TABLE 2 Details of Amorphous Resins, PolyolefinicResins and Fine Powders Symbol Name of material Trade name Description(Amorphous resin) a cycloolefin-ethylene copolymer Mitsui Chemicals,Inc., APL6015 glass transition point = 140° C. b cycloolefin-ethylenecopolymer Mitsui Chemicals, Inc., APL6013 glass transition point = 125°C. c cycloolefin-ethylene copolymer Mitsui Chemicals, Inc., APL6509glass transition point = 80° C. d cycloolefin-ethylene copolymer MitsuiChemicals, Inc., APL5018 glass transition point = 160° C. ecycloolefin-ethylene copolymer Mitsui Chemicals, Inc., APL6011 glasstransition point = 105° C. f cycloolefinic polymer Zeon Corporation,Zeonor 1020R glass transition point = 105° C. g atactic polystyrene A&MStyrene Co., Ltd., GPPS-G8259 glass transition point = 100° C.(Polyolefinic resin) α highly-crystallized propylene Nihon PolychemK.K., MA4U MFR = 5.0 g/10 min, crystallinity = 60%, homopolymer meltingpeak temperature = 165° C., melting completion temperature = 171° C. âpropylene homopolymer Nihon Polychem K.K., MA4 MFR = 5.0 g/10 min,melting peak temperature = 160° C., melting completion temperature =167° C. ã ethylene homopolymer Nihon Polychem K.K., HJ360 MFR = 5.5 g/10min, melting peak temperature = 130° C., melting completion temperature= 135° C. (Fine powder) A surface-modified precipitated Maruo CalciumCo., Ltd., MC-S5 average grain size = 0.1 μm, modified with calciumcarbonate aliphatic acid and sulfonic acid B surface-modifiedprecipitated Maruo Calcium Co., Ltd., MSK-PO average grain size = 0.15μm, calcium carbonate modified with aliphatic acid C precipitatedcalcium carbonate Shiraishi Kogyo K.K., Brilliant-15 average grain size= 0.15 μm D heavy calcium carbonate Bihoku Funka Kogyo K.K., Softon#3200 average grain size = 0.7 μm E heavy calcium carbonate Bihoku FunkaKogyo K.K., Softon #1800 average grain size = 1.25 μm F surface-modifiedheavy calcium Maruo Calcium Co., Ltd., Nanocoat S-25 average grain size= 1.1 μm, carbonate modified with aliphatic acid

[0112] TABLE 3 Consitution of amorphous resin-containing layer (B)Constitution Stretching Amorphous resin of surface direction GlassPolyolefinic layer (C) of base transition resin Fine powder layer pointContent Content Stretching Porosity Content (A) Type (° C.) (wt %) Type(wt %) direction (%) Type (wt %) Example 1 biaxial a 140 50 α 50uniaxial 4 A 55 Example 2 biaxial e 105 20 α 80 uniaxial 0 A 55 Example3 biaxial e 105 70 α 30 uniaxial 0 A 55 Example 4 biaxial b 125 50 α 50uniaxial 0 A 55 Example 5 biaxial c 80 50 α 50 uniaxial 0 A 55 Example 6biaxial f 105 50 α 50 uniaxial 0 A 55 Example 7 biaxial g 100 50 α 50uniaxial 0 A 55 Example 8 biaxial e 105 50 α 50 uniaxial 0 A 35 Example9 biaxial e 105 50 α 50 uniaxial 0 A 45 Example 10 biaxial e 105 50 α 50uniaxial 0 A 55 Example 11 biaxial e 105 50 α 50 uniaxial 0 A 65 Example12 biaxial e 105 50 α 50 uniaxial 0 B 55 Example 13 biaxial e 105 50 α50 uniaxial 0 C 45 Example 14 biaxial e 105 50 α 50 uniaxial 0 D 55Example 15 biaxial e 105 50 α 50 uniaxial 0 E 55 Example 16 biaxial e105 50 α 50 uniaxial 0 F 55 Example 17 biaxial e 105 50 β 50 uniaxial 0A 55 Example 18 biaxial c 80 50 β 50 uniaxial 0 A 55 Example 19 biaxiale 105 50 β 25 uniaxial 0 A 55 γ 25 Example 20 biaxial e 105 50 α 50uniaxial 0 A 55 Example 21 biaxial e 105 50 α 50 biaxial 0 A 55 Example22 uniaxial c 80 50 α 50 uniaxial 0 A 55 Comparative biaxial — — — β 55uniaxial 30 E 3 Example 1 Comparative biaxial d 160 20 α 80 uniaxial 26E 55 Example 2 Comparative biaxial d 160 50 α 50 uniaxial 38 E 55Example 3 Smoothness Offset printing of surface suitability Provision oflayer (C) Opacity Waving intermediate of stretched of stretched Curl inInk layer film film height practical drying (D) (sec) (%) (mm) printingproperty Example 1 yes 12000 94 5 ◯ 5 Example 2 yes 12000 94 2 ◯ 5Example 3 yes 12000 94 0 ◯ 5 Example 4 yes 12000 94 0 ◯ 5 Example 5 yes12000 94 1 ◯ 5 Example 6 yes 12000 94 0 ◯ 5 Example 7 yes 12000 94 0 ◯ 5Example 8 yes 5000 93 0 ◯ 4 Example 9 yes 8000 93 0 ◯ 5 Example 10 yes12000 94 0 ◯ 5 Example 11 yes 15000 94 0 ◯ 5 Example 12 yes 10000 94 0 ◯5 Example 13 yes 6000 93 0 ◯ 5 Example 14 yes 3000 94 0 ◯ 5 Example 15yes 1000 94 0 ◯ 5 Example 16 yes 2000 94 0 ◯ 5 Example 17 yes 12000 94 2◯ 5 Example 18 yes 12000 94 1 ◯ 5 Example 19 yes 12000 94 1 ◯ 5 Example20 no 12000 91 0 ◯ 5 Example 21 no 12000 90 1 ◯ 5 Example 22 no 12000 841 ◯ 5 Comparative yes 5000 93 33 X 2 Example 1 Comparative yes 12000 9627 X 5 Example 2 Comparative yes 12000 96 30 X 5 Example 3

[0113] TABLE 4 Consitution of amorphous resin-containing layer (B)Stretching Amorphous resin Offset printing direction Glass PolyolefinicProvision of Opacity suitability of base transition resin intermediateof stretched Curl Waving layer point Content Content Stretching layerfilm height in practical (A) Type (° C.) (wt %) Type (wt %) directionPorosity (%) (D) (%) (mm) printing Example 23 biaxial a 140 20 α 80uniaxial 3 yes 93 4 ◯ Example 24 biaxial a 140 50 α 50 uniaxial 5 yes 945 ◯ Example 25 biaxial b 125 20 α 80 uniaxial 0 yes 93 2 ◯ Example 26biaxial b 125 50 α 50 uniaxial 0 yes 93 0 ◯ Example 27 biaxial b 125 70α 30 uniaxial 0 yes 94 0 ◯ Example 28 biaxial c 80 50 α 50 uniaxial 0yes 94 1 ◯ Example 29 biaxial f 105 50 α 50 uniaxial 0 yes 94 0 ◯Example 30 biaxial a 140 20 β 80 uniaxial 2 yes 94 6 ◯ Example 31biaxial b 125 50 β 50 uniaxial 0 yes 94 2 ◯ Example 32 biaxial c 80 50 β50 uniaxial 0 yes 94 1 ◯ Example 33 biaxial b 125 50 γ 50 uniaxial 0 yes93 2 ◯ Example 34 biaxial b 125 50 β 25 uniaxial 0 yes 93 1 ◯ γ 25Example 35 biaxial b 125 50 α 50 uniaxial 0 no 89 0 ◯ Example 36 biaxialb 125 50 α 50 biaxial 0 no 88 1 ◯ Example 37 uniaxial c 80 50 α 50uniaxial 0 no 83 1 ◯ Comparative biaxial — — — β 55 uniaxial 30 yes 9635 X Example 4 Comparative biaxial d 160 20 α 80 uniaxial 26 yes 96 29 XExample 5 Comparative biaxial d 160 50 α 50 uniaxial 38 yes 96 32 XExample 6

[0114] TABLE 5 Consitution of amorphous resin-containing layer (B)Offset printing Stretching Amorphous resin suitability direction GlassPolyolefinic Provision of Opacity of Waving of base transition resinintermediate stretched Curl in Ink layer point Content ContentStretching Porosity layer film height practical drying (A) Type (° C.)(wt %) Type (wt %) direction (%) (D) (%) (mm) printing property Example38 25 b 125 20 α 80 uniaxial 0 yes 96 1 ◯ 5 Example 39 26 b 125 50 α 50uniaxial 0 yes 96 0 ◯ 5 Example 40 28 c 80 50 α 50 uniaxial 0 yes 96 0 ◯5 Example 41 31 b 125 50 β 50 uniaxial 0 yes 96 1 ◯ 5 Example 42 32 c 8050 β 50 uniaxial 0 yes 96 0 ◯ 5 Example 43 33 b 125 50 γ 50 uniaxial 0yes 96 1 ◯ 5 Example 44 34 b 125 50 β 25 uniaxial 0 yes 96 0 ◯ 5 γ 25Example 45 35 b 125 50 α 50 uniaxial 0 no 94 0 ◯ 5 Example 46 36 b 12550 α 50 biaxial 0 no 94 0 ◯ 5 Example 47 37 c 80 50 α 50 uniaxial 0 no92 0 ◯ 5

Industrial Applicability

[0115] The multi-layered stretched resin film of the present inventionis successfully exempt from being waved or curled due to vehiclecontained in offset printing ink during offset printing. This ensures anexcellent printability of such multi-layered stretched resin film. Themulti-layered stretched resin film is advantageous when used as amaterial for map, book cover, wrapping paper, book paper, sticker sheet,poster paper, menu sheet, hanging screen, label, shopping bag,cardboard, brochure, and illuminated sign board and so forth.

What is claimed is:
 1. A multi-layered stretched resin film comprising:a base layer (A) containing 40 to 90 wt % of a polyolefinic resin and 10to 60 wt % of an inorganic fine powder or an organic filler; and anamorphous resin-containing layer (B) provided on at least one side ofsuch base layer (A), and containing 0 to 85 wt % of a polyolefinic resinand 15 to 100 wt % of an amorphous resin; said amorphousresin-containing layer (B) having a porosity of 5% or below.
 2. Amulti-layered stretched resin film as claimed in claim 1, wherein saidamorphous resin is a cycloolefinic resin.
 3. A multi-layered stretchedresin film as claimed in claim 1, wherein said amorphous resin has aglass transition point of 140° C. or below.
 4. A multi-layered stretchedresin film as claimed in claim 1, wherein said polyolefinic resincontained in the amorphous resin-containing layer (B) is any one ofpropylene-base resin, ethylene-base resin and a mixture thereof.
 5. Amulti-layered stretched resin film as claimed in claim 1, wherein saidamorphous resin-containing layer (B) has a thickness of 1 to 100 μm. 6.A multi-layered stretched resin film as claimed in claim 1, wherein saidamorphous resin-containing layer (B) is formed only on one side of saidbase layer (A).
 7. A multi-layered stretched resin film as claimed inclaim 1, wherein said amorphous resin-containing layer (B) is formed onboth sides of said base layer (A).
 8. A multi-layered stretched resinfilm as claimed in claim 1, further comprising a surface layer (C)containing 30 to 85 wt % of a polyolefinic resin and 15 to 70 wt % of aninorganic fine powder or an organic filler, said surface layer (C) beingprovided on at least one side of a stack which comprises said base layer(A) and said amorphous resin-containing layer (B) provided on at leastone side thereof.
 9. A multi-layered stretched resin film as claimed inclaim 8, wherein said surface layer (C) has a thickness of 1 to 100 μm.10. A multi-layered stretched resin film as claimed in claim 8, whereinthe grain size of the inorganic fine powder or the average dispersiongrain size of the organic filler in said surface layer (C) is within arange from 0.01 to 6 μm.
 11. A multi-layered stretched resin film asclaimed in claim 8, wherein the inorganic fine powder or the organicfiller in said surface layer (C) comprises calcium carbonate.
 12. Amulti-layered stretched resin film as claimed in claim 11, wherein theinorganic fine powder or the organic filler in said surface layer (C)comprises surface-modified calcium carbonate.
 13. A multi-layeredstretched resin film as claimed in claim 8, wherein said surface layer(C) has a smoothness in compliance with JIS P-8119 of 20,000 sec orless.
 14. A multi-layered stretched resin film as claimed in claim 8,wherein said surface layer (C) is formed only on one side of said stack.15. A multi-layered stretched resin film as claimed in claim 8, whereinsaid surface layer (C) is formed on both sides of said stack.
 16. Amulti-layered stretched resin film as claimed in any claim 1, whereinsaid base layer (A), said amorphous resin-containing layer (B) and/orsaid surface layer (C) containing 30 to 85 wt % of a polyolefinic resinand 15 to 70 wt % of an inorganic fine powder or an organic filler forma stack having any one constitution of (C)/(B)/(A)/(B)/(C),(C)/(B)/(A)/(B), (C)/(B)/(A)/(C), (C)/(B)/(A), (B)/(A)/(B), (B)/(A)/(C)and (B)/(A).
 17. A multi-layered stretched resin film as claimed inclaim 1, further comprising an intermediate layer (D) comprising apolypropylene-base resin containing 8 to 55 wt % of an inorganic finepowder, said intermediate layer (D) being provided between said baselayer (A) and said amorphous resin-containing layer (B) or said surfacelayer (C).
 18. A multi-layered stretched resin film as claimed in claim17, wherein said intermediate layer (D) contains any onelow-melting-point resin selected from the group comprisingpropylene-base copolymer, high-density polyethylene, polystyrene orethylene-vinyl acetate copolymer.
 19. A multi-layered stretched resinfilm as claimed in claim 1 having an opacity in compliance with JISP-8138 of 70% or above.
 20. A multi-layered stretched resin film asclaimed in claim 1 having on the outermost layer thereof a pigmentcoated layer.